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[SOLVED]820-4924 Not charging/recognising battery.

New member

820-4924 runs of a battery however states no battery installed. Sometimes it recognises the battery at 99% but that quickly changes to 'service battery' and then a cross.

Ive tried a new battery. SDA jumps from 3.42V to 0V then back to 3.42V in a really strange manor. D7050 replaced, no change, ISL6259 replaced No change, SMC replaced no change. Battery connector removed to check for corrosion and was clean. Pull up resistor checked and is fine, Traces to the pullup resistor checked with no issues.

Administrator

New member

Think the board was cleaned before it got to me, it was really clean with no signs of liquid. I looked at the pullups under a microscope and noticed a micro break between a probe point and the SDA trace that runs to the SMC i cut the mask of the trace with a razor blade and used 0.1mm magnet wire to solder directly to the trace.